在线合成应用于 DEC/EMC 合成的高稳定性产品衍生催化剂,不产生共沸物

IF 7.2 2区 工程技术 Q1 CHEMISTRY, APPLIED
Zhentao Zhao , Yuxin Wang , Jian Shi , Guangwen Xu , Lei Shi
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引用次数: 0

摘要

碳酸乙烯酯(EC)与乙醇(EtOH)之间的一步酯交换反应可有效防止在合成碳酸二乙酯(DEC)/碳酸甲乙酯(EMC)过程中形成共沸物。然而,由于 EtOH 分子的体积和电子效应的影响,催化活性不足。在本研究中,我们提出了一种催化剂在线合成技术,并制备了一种独特的异相碱催化剂 PS-(NR3OH)EG。该技术简化了催化剂的制备过程,并防止其暴露于空气中的水和二氧化碳。PS-(NR3OH)EG 的活性位点来自产品乙二醇 (EG)。PS-(NR3OH)EG 在促进 EC 和 EtOH 酯交换反应方面表现出优异的催化性能。对 PS-(NR3OH)EG 的理化性质进行了分析,并对反应条件进行了优化。结果表明,与之前报道的同类催化剂相比,PS-(NR3OH)EG 具有更高的催化活性和稳定性。值得注意的是,在固定床反应器中连续反应 500 小时后,PS-(NR3OH)EG 仍能保持其初始催化活性。这项研究为催化剂制备和酯交换反应工艺设计提供了理论和实验指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On-line synthesis of highly stable product-derived catalysts applied in DEC/EMC synthesis without azeotrope generation

One-step transesterification between ethylene carbonate (EC) and ethanol (EtOH) can effectively prevent the formation of azeotropes in the synthesis of diethyl carbonate (DEC) / ethyl methyl carbonate (EMC). However, owing to the influence of volume and electronic effects of EtOH molecules, the catalytic activity is insufficient. In this study, we propose an on-line synthesis technique for catalysts and prepare a unique heterogeneous alkali catalyst, PS-(NR3OH)EG. This technique simplifies the catalyst preparation process and protects it from exposure to water and carbon dioxide in the air. The active sites of PS-(NR3OH)EG are derived from the product ethylene glycol (EG). PS-(NR3OH)EG exhibits excellent catalytic performance in promoting EC and EtOH transesterification. The physicochemical properties of PS-(NR3OH)EG are analysed, and the reaction conditions are optimized. The results indicate that PS-(NR3OH)EG has superior catalytic activity and stability compared to the similar previously reported catalysts. Notably, after continuous reaction in a fixed-bed reactor for 500 h, PS-(NR3OH)EG maintain its initial catalytic activity. This study provides theoretical and experimental guidance for catalyst preparation and transesterification reaction process design.

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来源期刊
Fuel Processing Technology
Fuel Processing Technology 工程技术-工程:化工
CiteScore
13.20
自引率
9.30%
发文量
398
审稿时长
26 days
期刊介绍: Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.
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